Paintable, in-reactor blended, thermoplastic polyolefin

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 23/10 (2006.01)

Patent

CA 2540850

A paintable impact copolymer composition is produced by in-reactor blending of a xylene insoluble polypropylene fraction and a xylene soluble ethylene- propylene rubber (EPR) fraction. The composition comprises from about 5 wt. % to about 50 wt.% a xylene-soluble portion and from about 50 wt. % to about 95 wt. % a xylene~insoluble portion. The ratio of the weight average molecular weight of said xylene~soluble portion to that of said xylene-insoluble portion is from about 0.5 to about 1.8. The intrinsic viscosity of said xylene-soluble portion is from about 0.5 to about 7.0 dL/g. The xylene-soluble portion comprises from about 30 to about 70 mole percent ethylene units.

L'invention porte sur une peinture résistant aux chocs à base de copolymère obtenue par mélange en réacteur d'une fraction de polypropylène insoluble dans le xylène, et d'une fraction de caoutchouc d'éthylène/propylène (EPR) soluble dans le xylène. La composition comprend d'environ 5 % en poids à environ 50 % en poids de la fraction soluble dans le xylène, et d'environ 50 % en poids à environ 95 % en poids de la fraction insoluble dans le xylène. Le rapport entre le poids moléculaire moyen de la fraction soluble dans le xylène à celui de la fraction insoluble dans le xylène est compris entre environ 0.5 et environ 1,8. La viscosité intrinsèque de la fraction soluble dans le xylène est comprise entre environ 0,5 et environ 7dl/g. La fraction soluble dans le xylène comporte un pourcentage molaire d'unités d'éthylène compris entre environ 30 et environ 70.

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